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DANGER! DANGER! DANGER!

A good tin foil hat must include a grounding straps. There have been several injuries reported those who failed to head this basic safety warning. Large potential voltages can build up on the tin foil due to the radiated energy they absorb. A grounding strap will allow that potential to safely dissipate.

A friend of mine learned this the hard way. Evedently, he'd been wearing his hat for several hours and had accumulated several hundred volts of potential energy. This energy was discharged in an incredibly painful manner when he visited the men's room.